LOS ANGELES, CA - NOVEMBER 23: (L-R) Niall Horan, Liam Payne, Zayn Malik, Louis Tomlinson and Harry Styles of One Direction pose in the press room at the 2014 American Music Awards at Nokia Theatre L.A. Live on November 23, 2014 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)

Artist of the year: One Direction

LOS ANGELES, CA - NOVEMBER 23: Niall Horan of One Direction poses in the press room at the 2014 American Music Awards at Nokia Theatre L.A. Live on November 23, 2014 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)

New artist of the year: 5 Seconds of Summer

LOS ANGELES, CA - NOVEMBER 23: (L-R) Musicians Luke Hemmings, Ashton Irwin, Calum Hood and Michael Clifford of 5 Seconds of Summer accept the award for New Artist of the Year Presented by Kohl's onstage during the 2014 American Music Awards held at Nokia Theatre L.A. Live on November 23, 2014 in Los Angeles, California. (Photo by Michael Tran/FilmMagic)

New artist of the year: 5 Seconds of Summer

LOS ANGELES, CA - NOVEMBER 23: (L-R) Musicians Calum Hood (L) and Michael Clifford of 5 Seconds of Summer accept the award for New Artist of the Year Presented by Kohl's onstage during the 2014 American Music Awards held at Nokia Theatre L.A. Live on November 23, 2014 in Los Angeles, California. (Photo by Michael Tran/FilmMagic)

LOS ANGELES, CA - NOVEMBER 23: Recording artist Sam Smith accepts the award for Favorite Pop/Rock Male Artist onstage during the 2014 American Music Awards held at Nokia Theatre L.A. Live on November 23, 2014 in Los Angeles, California. (Photo by Michael Tran/FilmMagic)

LOS ANGELES, CA - NOVEMBER 23: (L-R) Recording artists Liam Payne, Louis Tomlinson, Zayn Malik, Niall Horan, and Harry Styles of One Direction accept the Favorite Pop/Rock Album award for 'Midnight Memories' onstage during the 2014 American Music Awards held at Nokia Theatre L.A. Live on November 23, 2014 in Los Angeles, California. (Photo by Michael Tran/FilmMagic)

Country male artist: Luke Bryan

LOS ANGELES, CA - NOVEMBER 23: Recording artist Luke Bryan accepts the award for Favorite Country Male Artist onstage during the 2014 American Music Awards held at Nokia Theatre L.A. Live on November 23, 2014 in Los Angeles, California. (Photo by Michael Tran/FilmMagic)

Country male artist: Luke Bryan

Luke Bryan poses with the award for Favorite Country Male Artist, in the press room at the 2014 American Music Awards at Nokia Theatre L.A. Live in Los Angeles, California, November 23, 2014. AFP PHOTO/FREDERIC J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)

Country album: Brantley Gilbert, "Just As I Am"

LOS ANGELES, CA - NOVEMBER 23: Recording artist Brantley Gilbert accepts the Favorite Country Album award for 'Just as I Am' onstage during the 2014 American Music Awards held at Nokia Theatre L.A. Live on November 23, 2014 in Los Angeles, California. (Photo by Michael Tran/FilmMagic)

Rap/hip-hop artist: Iggy Azalea

LOS ANGELES, CA - NOVEMBER 23: Recording artist Iggy Azalea (L) and T.I. accept the Favorite Rap/Hip-Hop Album award for 'The New Classic' onstage at the 2014 American Music Awards at Nokia Theatre L.A. Live on November 23, 2014 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)

Alternative rock: Imagine Dragons

LOS ANGELES, CA - NOVEMBER 23: (L-R) Musicians Daniel Wayne Sermon, Ben McKee, Daniel Platzman and Dan Reynolds of Imagine Dragons accept the award for Favorite Alternate Artist onstage during the 2014 American Music Awards held at Nokia Theatre L.A. Live on November 23, 2014 in Los Angeles, California. (Photo by Michael Tran/FilmMagic)

LOS ANGELES, CA - NOVEMBER 23: Singer Taylor Swift attends the press room at the 42nd Annual American Music Awards at Nokia Theatre L.A. Live on November 23, 2014 in Los Angeles, California. (Photo by David Livingston/Getty Images)

LOS ANGELES, CA - NOVEMBER 23: Taylor Swift and Sam Smith attend the 2014 American Music Awards at Nokia Theatre L.A. Live on November 23, 2014 in Los Angeles, California. (Photo by Kevin Mazur/AMA2014/WireImage)

LOS ANGELES, CA - NOVEMBER 23: Singer Taylor Swift poses in the press room at the 2014 American Music Awards at Nokia Theatre L.A. Live on November 23, 2014 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)